PENSION PLANS AND RETIREMENT BENEFITS (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension Benefits
Service Cost	$ 2.7	$ 2.4
Interest Cost	21.6	21.7
Expected return on plans' assets	(36.8)	(37.2)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.0	0.0
Recognized acturial loss	8.8	6.6
Net periodic benefit (income) cost	(3.7)	(6.5)
Other Postretirement Benefits
Service Cost	0.3	0.3
Interest Cost	0.4	0.4
Expected return on plans' assets	0.0	0.0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.0	(0.6)
Recognized acturial loss	0.6	0.6
Net periodic benefit (income) cost	$ 1.3	$ 0.7